I dunno about the i3, but I am seeing a lot of X1s in Valencia Orange. It appears to be a popular choice amongst SAV buyers. I personally don't like it on the X1 and think they should've kept it exclusive to the 1///M, but BMW obviously decided otherwise...

In fact, it just doesn't look that good on any other BMW, not yet at least. So it kind of belongs to 1M, whoever chooses it for whatever other model can't change it